Mimas

Mimas is the smallest known object that has enough gravity to pull itself into a rounded shape.

The surface area of Mimas is about the same as the surface area of California, or that of Spain.

The most conspicuous feature on Mimas is a giant impact crater, about 80 miles in diameter. The edge of Herschel Crater is marked by cliffs about 16,000 feet high, and a peak in the center of the crater rises about 19,000 feet above the crater floor.

The gravitational pull of Mimas, combined with the position of its orbit, caused the division between Saturn’s A and B rings.

You can view this link to learn more about Mimas and the other moons of Saturn: